Taught you how to detect pressure gauge1

Pressure gauge, English name: pressure the gauge) , it was based on the elastic element of the sensitive element, the measure instrument and instructions above environmental pressures. Pressure gauge, 压力表) Application is very common, it almost throughout all of the industrial process and research fields. In the heat pipe network, oil and gas transmission, water supply, gas supply system, vehicle maintenance factory store. 。 。 Application, pressure gauge can be seen everywhere. Today for everyone to introduce pressure several table testing steps: a, 1, new appearance inspection system pressure gauge surface should be smooth and even, no rust. Burr, electroless plating, welding should be smooth and beautiful. Part 2, reading, pressure gauges should be colorless transparent glass or plastic cover, should not stop reading. Dial should level off, the logo clear bright and clean. 3, zero, with a limit pin gauge, in the absence of pressure pointer should be close to the stop pin, infinite check pin gauge, in the absence of pressure pointer should be within the zero mark. 4, pressure gauge if liquid, the liquid should be clear and transparent, without impurities or debris, the liquid level height should be located in the heart of the case above 0. 25 d - 0. 3 d ( D for meter diameter) And in 60 degrees thermostatic box no leakage phenomenon. 2, 1 meter, choose the right standard, the standard error of the absolute value should be allowed no more than the 1/4 of test pressure gauge permissible error absolute value. 2, standard instruments available spring tube type precision pressure gauge and vacuum gauge, piston manometer, piston vacuum pressure gauge (3), hysterisis error, and the tapping of error of displacement of calibration and verification method of error, 1 in value of the pressure gauge verification, according to the numbered dividing line gradually step up smoothly when verification ( Or step-down) When reach the detection limit value, then cut off pressure source, pressure 3 min, and then press the original fixed-point smooth step-down, Or booster) Check back in reverse chronological order. 2, hysterisis error, on the same point check regularly in the booster ( Or step-down) And buck ( Or booster) Verification, the provisions of the permissible error absolute value. 3, tapping the displacement of each point check regularly, the booster ( Or step-down) And buck ( Or booster) After verification, the lighter case caused by changes in value is more than half of the permissible error absolute value. 4, the error value, for each inspection point in the booster ( Or step-down) And buck ( Or booster) Verification, lightweight case before and after with the standard value for the difference between the value should comply with the requirements.